Jan-Willem Bobbink's site about his experiences with balls of light. Also crop circle reports and diagrams.
Article about the science, nature, politics and spirituality of crop circles.
Suzanne Taylor's page on the subject, articles, reconstructions, reports and interviews with researchers.
Edited and designed by Dirk Wessels: scientific articles, anomality specifics and crop circles and etheric energies.
As usual on Ellie Crystals site - good introduction to the subject with images and links to latest developments.
Complete archive of formations dating back to 1590. Articles and other resources. Both Dutch and English.
Reports and articles about Dutch crop circles.
Leading annual conference on crop formations and related issues, in Glastonbury, SW England, July/August.
Educational Tours to Sacred Sites, Crop Circles in Southern England every July. Remote Viewing and Circles Tours, Advances Circles Research Programs. Stonehenge, Avebury, Merlin's Barrow, Rollright, Wayland Smithey, Crop Circles 10th year of tours, first and best.
The first place to look for all the information on Oxfordshire crop formations.